Class NEET 2026 ALL Q #2055
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Colostrum, secreted by mother during initial days of lactation, is abundant in
(A) IgD
(B) IgG
(C) IgM
(D) IgA
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Correct Answer: D

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Detailed Solution

Step 1: Understanding Colostrum

Colostrum is the yellowish fluid secreted by the mother during the initial days of lactation. It is biologically significant as it provides the first passive immunity to the newborn infant.

Step 2: Identifying the Immunoglobulin

The primary antibody present in colostrum is Immunoglobulin A (IgA). This antibody is crucial for protecting the infant's gastrointestinal tract from pathogens, as the infant's own immune system is not yet fully developed.

Step 3: Evaluating Options

While other antibodies like IgG are involved in systemic immunity (and can cross the placenta), IgA is the specific antibody concentrated in secretions like breast milk, saliva, and tears.

Final Answer: IgA

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because it requires the student to recall specific biological knowledge and apply it to identify the correct immunological component in a physiological context.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific terminology and biological facts regarding human health and disease as outlined in the NCERT curriculum.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE (Textbook). This is a direct retrieval question from the Human Health and Disease chapter, which is a high-yield topic for medical entrance examinations.

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